I'm not sure what smoker you are using. If you can get it up to 300 or 325 in the last hour / hour and a half your skin should crisp up. I use an MES but its a 1200 watt unit. While the controller will only go up to 275 the smoker temperature will actually hit about 315.
If you're using an electric smoker that won't get that high then put the bird in the oven for the last hour. No shame in doing that brother!